High poly to Low poly Texture Baking - wrong pixels (texture map)
First make sure that your UV's have a bit of an Island margin, then place the low poly model on top of your high poly, give it a subdivision surface modifier, make it something high to closely match the high poly model but do not apply the modifier, then give it a shrinkwrap modifier to wrap it around the high poly but do not apply the modifier, than select the high poly model and the low poly after then bake.